[Oracleasm-users] RHAT 4 update 2 multipath

[Clemens Bleile]

Hi,

one thing to keep in mind: When the ASMLIB scans for devices it checks

/proc/partitions

Usually multipath-device-partitions are named dm-<number>. I.e. you 
usually have to configure in your oracleasm-file:

ORACLEASM_SCANORDER=dm

ORACLEASM_SCANEXCLUDE=sd


Ciao

Clemens

Rodionov, Sergey wrote:

>Thanks for prompt response,
>
>How to label member disk? Is it the same like create link on device (like ln
>-s).
>
>I can create ASM disk with /dev/sdb3 but in this case multipath does not
>work.
>
>  Sergey Rodionov
>
>-----Original Message-----
>From: Joel Becker [mailto:Joel.Becker at oracle.com]
>Sent: Friday, October 21, 2005 5:27 PM
>To: Rodionov, Sergey
>Cc: 'oracleasm-users at oss.oracle.com'
>Subject: Re: [Oracleasm-users] RHAT 4 update 2 multipath
>
>
>On Fri, Oct 21, 2005 at 05:07:37PM -0400, Rodionov, Sergey wrote:
>  
>
>>[root at hacksaw mapper]# asmtool -l /dev/oracleasm -C -n REP1 -s
>>/dev/mapper/360a9800056716a37473430716c465849p3
>>asmtool: Device "/dev/mapper/360a9800056716a37473430716c465849p3" is not a
>>partition
>> I have created trace file :
>> strace -f -o /tmp/log asmtool -l /dev/oracleasm -C -n REP1 -s
>>/dev/mapper/360a9800056716a37473430716c465849p
>>    
>>
>
>	Yes, dm does not provide HDIO_GETGEO, so I cannot determine that
>the device is, indeed, a partition.  I'm working on a solution.
>	The workaround is to label the member disk (/dev/sdXN) and then
>restart ASMLib.  ASMLib will happily discover existing devices, it only
>errors when trying to _create_ an unpartitioned device.
>	See also http://otn.oracle.com/tech/linux/asmlib/multipath.html
>for tips on making sure ASMLib sees your multipath device first.
>
>Joel
>
>  
>
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